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US5496233A
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Control device and a method for controlling and resetting a lock up hydraulic pressure schedule for subsequent gear shiftings in an automatic transmission
Assignee: Aisin Corp
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Filing: 1994-08-31
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Granted: 1996-03-05
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Expires: 2014-08-31
Abstract
Abstract A locking-up hydraulic pressure control device of an automatic transmission comprises a memory, a controller, a second memory, and a time schedule management. The memory stores a hydraulic pressure control time schedule from the beginning of shift operation to the end. The controller means controls a locking-up hydraulic pressure in accordance with said hydraulic pressure control time schedule to be provided to a lock-up clutch that mechanically connects and disconnects a pump impeller of a torque converter of said automatic transmission connected to an engine and a turbine runner connected to transmission gears. The second memory stores a time schedule of engine revolution during a shift operation. The time schedule management means resets said hydraulic pressure control time schedule higher pressures than the former pressures in case if engine revolution exceeds said time schedule of engine revolution during the shift operation by a certain given limit.
Inventors
- 👤 Toshiaki Ishiguro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:05
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/14; F16H61/143; F16H61/04; F16H2061/0477
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
144 words
In a lock-up hydraulic pressure control device of an automatic transmission comprising: means for memory storing a schedule of hydraulic pressures with respect to time from the beginning of shift operation to the end; a control means for controlling a looking-up hydraulic pressure in accordance with said schedule to be provided to a lock-up clutch of a hydrodynamic torque converter said automatic transmission and an engine, the improvement comprising a second means for storing a time schedule of reference engine means for detecting engine speeds during said shift operation; means for determining the differences between said detected engine speeds and said reference engine speeds; pressure control means for resetting said hydraulic pressure in said schedule for subsequent shifts at higher pressures than the former pressures if a difference between engine speeds and reference engine speeds exceeds a certain given limit during said shift operation.
Claim 2
Dependent Claim
144 words
In a lock-up hydraulic pressure control device of an automatic transmission comprising: means for memory storing a schedule of hydraulic pressures with respect to time from the beginning of shift operation to the end; a control means for controlling a looking-up hydraulic pressure in accordance with said schedule to be provided to a lock-up clutch of a hydrodynamic torque converter said automatic transmission and an engine, the improvement comprising a second means for storing a time schedule of reference engine means for detecting engine speeds during said shift operation; means for determining the differences between said detected engine speeds and said reference engine speeds; pressure control means for resetting said hydraulic pressure in said schedule for subsequent shifts at higher pressures than the former pressures if a difference between engine speeds and reference engine speeds exceeds a certain given limit during said shift operation.
Claim 3
Dependent Claim
39 words
In a lock-up hydraulic pressure control device of said automatic transmission according to claim 1, wherein said pressure control means increases said hydraulic pressure of said hydraulic schedule by a certain given ratio higher than before said shifting operation.
Claim 4
Dependent Claim
138 words
In a method for controlling a lock-up hydraulic pressure in an automatic transmission, which controls said hydraulic pressure in accordance with a hydraulic pressure control time schedule to be provided to a lock-up clutch that mechanically connects and disconnects a pump impeller of a torque converter of said automatic transmission connected to an engine and a turbine runner connected to transmission gears during a gear shifting operation, the improvement comprising the steps of detecting engine speeds, determining the difference between the detected engine speeds and reference engine resetting said hydraulic pressure control time schedule to have higher pressures than the former pressures if a difference between detected engine speeds and reference engine speeds exceeds a certain given limit and controlling said hydraulic pressure for subsequent shift operations in accordance with the resulting reset hydraulic pressure control time schedule.
Claim 5
Dependent Claim
138 words
In a method for controlling a lock-up hydraulic pressure in an automatic transmission, which controls said hydraulic pressure in accordance with a hydraulic pressure control time schedule to be provided to a lock-up clutch that mechanically connects and disconnects a pump impeller of a torque converter of said automatic transmission connected to an engine and a turbine runner connected to transmission gears during a gear shifting operation, the improvement comprising the steps of detecting engine speeds, determining the difference between the detected engine speeds and reference engine resetting said hydraulic pressure control time schedule to have higher pressures than the former pressures if a difference between detected engine speeds and reference engine speeds exceeds a certain given limit and controlling said hydraulic pressure for subsequent shift operations in accordance with the resulting reset hydraulic pressure control time schedule.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-03-05 | 1999-09-04 | 2000-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-03-05 | 2003-09-04 | 2004-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-03-05 | 2007-09-04 | 2008-03-05 | $7700.00 | Window Closed / Lapsed |